<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const properties = [
        '中华园,北京市,公寓',
        '华景苑,上海市,别墅',
        '新城市广场,深圳市,公寓',
        '雅居乐花园,广州市,别墅',
        '恒大城,广州市,公寓',
        '太阳花园,北京市,别墅',
      ]
      const obj = {}
      properties.map((item) => {
        const [cityName, city, type] = item.split(',')
        // console.log(type)
        // console.log(item.split(','))
        obj[type] || (obj[type] = [])
        obj[type].push(cityName)
      })
      console.log(obj)
    </script>
  </body>
</html>
